Very dangerous.
Having worked with high power lasers, even the reflected light off of a non reflective surface can cause eye damage to those not wearing protection. At these power levels they are Fucking up random people’s eyes as they are just walking by.
Wood doesn't directly reflect laser light and burns right away (charred surface absorbs even more)
Power is adjustable and I don't think they need 100% of it to cut the trees/branches shown in the vid.
I dont even know if welding glasses would be enough protection
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